GMC 2016 Sierra Denali Owner's Manual page 199

198 Driving and Operating
6-Speed Automatic Transmission
Gear before shifting from D
(Drive) to M (Manual Mode)
Range after shifting from D
(Drive) to M (Manual Mode)
8-Speed Automatic Transmission
Gear before
shifting from D
8th
(Drive) to M
(Manual Mode)
Range after
shifting from
D (Drive) to
M6
M (Manual Mode)
Tow/Haul not
engaged
Range after
shifting from
D (Drive) to
M6
M (Manual Mode)
Tow/Haul
engaged
6th 5th 4th
M4 M4 M3
7th 6th 5th 4th
M6 M5 M4 M3
M5 M4 M3 M3
Grade Braking is not available when
Range Selection Mode is active.
3rd 2nd 1st
See Tow/Haul Mode 0 199.
While using Range Selection Mode,
M2 M2 M1
cruise control and the Tow/Haul
Mode can be used.
If the vehicle has an exhaust brake,
it can also be used, but will not
automatically downshift the
transmission. See Exhaust Brake
in the Duramax diesel supplement.
3rd 2nd 1st
M3 M2 M1
M3 M2 M1
Caution
Spinning the tires or holding the
vehicle in one place on a hill
using only the accelerator pedal
may damage the transmission.
The repair will not be covered by
the vehicle warranty. If you are
stuck, do not spin the tires. When
stopping on a hill, use the brakes
to hold the vehicle in place.